Search Result for "opisthotonos": 
Wordnet 3.0

NOUN (1)

1. severe spasm in which the back arches and the head bends back and heels flex toward the back; 



The Collaborative International Dictionary of English v.0.48:

Opisthotonos \Op`is*thot"o*nos\, n. [NL., from Gr. ? backwards +
   ? a stretching.] (Med.)
   A tetanic spasm in which the body is bent backwards and
   stiffened.
   [1913 Webster]


WordNet (r) 3.0 (2006):

opisthotonos
    n 1: severe spasm in which the back arches and the head bends
         back and heels flex toward the back